Ruler drawing can only be done with compasses and scaleless rulers. Although there are few tools, the figures that can be drawn correctly are more accurate than those drawn by measurement.

The ruler must have no scale, infinite length, and only one side fixed with the ruler. Can only be used to connect two points, not to draw a scale on the screen. Compasses can be opened to infinite width, but there can be no scale on them, only to the length constructed before.

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Precautions:

Triangular drawing problems can usually be decomposed into several basic diagrams, which can be completed by stringing them together according to certain procedures. However, for complex drawing problems, it is often necessary to draw a sketch that is supposed to be suitable for known conditions and analyze it according to this sketch. Sometimes the local triangle can be made according to the known conditions and the basic drawing method, and then the rest can be made by applying the relevant conditions in combination with the basic drawing method, thus completing the drawing.

Pay attention to the traces of drawing: after drawing is completed, do not erase the necessary traces of drawing, but keep the traces of basic drawing in the process of drawing to reflect the graphics made by the ruler.

Pay attention to the following conclusion: sometimes drawing questions don't need to be written, but a drawing question is composed of several basic pictures. In order to clearly express the meaning of the question, we must draw a conclusion and point out which figure to make.

Baidu Encyclopedia-Ruler Drawing

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